package com.atguigu.gulimall.cart.interceptor;


import com.alibaba.nacos.common.util.UuidUtils;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.to.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;


/**
 * 设置拦截器，访问购物车任意链接都能判断cookie
 */
public class CartInterceptor implements HandlerInterceptor {


    public static ThreadLocal<UserInfoTo> toThreadLocal = new ThreadLocal<>();

    /**
     * 目标方式执行之前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo memberRespVo = (MemberRespVo) session.getAttribute(AuthServerConstant.SESSION_LOGIN_KEY);//获取gulimall.com下的session
        if(memberRespVo != null){
            userInfoTo.setUserId(memberRespVo.getId());
        }

        Cookie[] cookies = request.getCookies();
        if(cookies != null && cookies.length > 0){
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);//标识为临时用户
                }
            }
        }

        //如果没有临时用户一定分配临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }

        //在目标方法执行之前设置当前线程的用户信息
        toThreadLocal.set(userInfoTo);

        return true;//放行
    }

    /**
     * 目标方法执行之后
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = toThreadLocal.get();
        if(!userInfoTo.getTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
